题目内容：
根据以下材料回答题 Wewalkedsoquietlythatthenurseatthedeskdidn'tevenlifthereyesfromthebook．MumpointedtoabigchairbythedoorandIknewshewantedmetohaveaseat．WhileIwatched,mouthopeninsurprise,mumtookoffherhatandcoatandgavethemtometohold．Shewalkedquietlytothesmallroombytheliftandtookoutawetmop(拖把)．Shepushedthemoppastthedeskandasthenurselookedup,mumnoddedandsaid,"Verydirtyfloors．"
"Yes．I'mgladthey'vefinallydecidedtocleanthem,"thenursesaid．Shelookedatmumstrangelyandsaid,"Butaren'tyouworkinglate?"
Mumjustpushedharder,eachswipe(拖)ofthemoptakingherfartherandfartherdownthehall．IwatcheduntilIcouldn'tseeherandthenursehadturnedbacktowriteinthebigbook．
Afteralongtimemumcameback．Hereyeswereshining．Sherapidlyputthemopbackandtookmyhand．Asweturnedtogooutofthedoor,mumnoddedpolitelytothenurseandsaid,"Thankyou．"
Outside,mumtoldme,"Dagmarisfine．Nofever．"
"Yousawher,mum?"
"Ofcourse．Itoldheraboutthehospitalrules,andshewillnotexpectusuntiltomorrow．Dadwillstopworryingaswell．It'safinehospital．Butsuchfloors!Amopisnogood．Youneedabrush．"
Whenshetookamopfromthesmallroomwhatmumreallywantedtodowas__________． A．tocleanthefloor
B．topleasethenurse
C．toseeapatient
D．tosurprisethestoryteller
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答案解析：